$151 Cheap American Airlines flights Philadelphia (PHL) to St. Louis (STL)

You can find budget-friendly return American Airlines flights from $264 from PHL to STL by sorting your results from “Price (lowest to highest)” on Expedia. Or look for options from $151 for a one-way journey.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

American Airlines flights to St. Louis are generally more affordable in the low-season months of January and February. Whether you’re after a one-way or a return ticket, you could land a better deal then.

For cheap American Airlines fares from Philadelphia Intl. Airport (PHL) to Lambert-St. Louis Intl. Airport (STL), start searching one to three months before your intended departure. Securing domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also influence the overall price. Sunday is typically the most affordable, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking on a Sunday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Take off on one of American Airlines’s 11 direct weekly flights from Philadelphia Intl. Airport (PHL) to Lambert-St. Louis Intl. Airport (STL). To see your options, enter your origin, dates and destination and hit search. Then use the “Nonstop” and “Airline” filters.

Take off from Philadelphia Intl. Airport (PHL) for Lambert-St. Louis Intl. Airport (STL) on a nonstop American Airlines flight, and you’ll be in the skies for approximately 2h 41m.

American Airlines has the most flights from Philadelphia Intl. Airport (PHL) to Lambert-St. Louis Intl. Airport (STL) on Saturday. With up to 2 daily departures, you’ll get the most flexibility and choice on this day.

The earliest American Airlines flight from PHL to STL departs at 11:15AM UTC-5, landing at 12:50PM UTC-6. If you want to set off later in the day, the last American Airlines flight leaves PHL at 6:54PM UTC-5 and lands at STL at 8:41PM UTC-6. Flying early is generally a good option as morning flights are least likely to experience cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

American Airlines flights from Philadelphia Intl. Airport (PHL) to St. Louis arrive at Lambert-St. Louis Intl. Airport (STL). This is the main gateway to this destination.

You’ll likely board an Embraer 175 or a Bombardier CRJ700 when flying American Airlines from Philadelphia Intl. Airport (PHL) to Lambert-St. Louis Intl. Airport (STL). However, keep in mind that a different plane may be assigned depending on operational reasons.

Depending on your ticket type, a fee is typically charged if you change or cancel your booking more than 24 hours after confirmation. To secure plane tickets with more flexibility, select our “No cancel fee” or “Changes included” filter when you look for flights. For more details on canceling or changing your reservation, visit “Trips,” select your flight and click on “Manage Booking.”